Abstract: Based on a pulsating analysis model, a hydraulic pump fault diagnosis approach is presented. By this approach, the diagnosis is based on the pressure signal measured at the outlet port of the pump. The obtained signal is transformed into frequency domain for performing wavelet analysis to separate the fault signal from the pressure signal at the time a fault occurs. This method is first evaluated via simulation analysis, and then validated against test data. Results showed that this wavelet based fault diagnosis method is capable of detecting pump failure using the outlet pressure pulsating signal.

Key words: Piston pump, Signal processing, Fault diagnosis, Wavelet